Tech Controllers ST-976 - Page 33

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Maximumtemperature
TheuserdefinestheminimumacceptableCHtemperatureatwhichthevalvewillclose.
Returnprotection
BUILT‐IN
VALVE/
ADDITIONAL
VALVE1,2 
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RETURN
PROTECTION
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OFF
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ON
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Minimumreturntemperature
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ThisfunctionallowssettingupCHboilerprotectionagainsttoocoolwaterreturningfromthemaincirculation,
whichcouldcauselow‐temperatureboilercorrosion.Thereturnprotectioninvolvesclosingthevalvewhen
thetemperatureistoolow,untiltheshortcirculationoftheboilerreachestheappropriatetemperature.
Minimumreturntemperature
Theuserdefinestheminimumacceptablereturntemperatureatwhichthevalvewillclose.
Valvepump
BUILT‐IN
VALVE/
ADDITIONAL
VALVE1,2 
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VALVEPUMP
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AlwaysON
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AlwaysOFF
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ONabovethreshold
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Pumpswitchontemperature
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Thisoptionenablestheusertoselectthepumpoperationmode:
o AlwaysON‐thepumpoperatesallthetime,regardlessoftemperatures.
o AlwaysOFF‐thepumpispermanentlydeactivatedandtheregulatorcontrolsonlyvalveoperation
o ONabovethreshold‐thepumpisactivatedabovethepre‐setswitch‐ontemperature.Ifthepump
istobeactivatedabovethethreshold,theusershouldalsodefinethepumpswitchontemperature.
ThetemperatureisreadfromCHsensor.
Factorysettings
Thisfunctionenablestheusertorestorethefactorysettingsforaparticularvalve.Restoringfactorysettings
doesnotchangethetypeofvalveselected(CHorfloor).
Valveremoval
NOTE
Thisoptionisavailableonlyforanadditionalvalve(usinganexternalmodule).
Thisoptionisusedtoremovethevalvefromthecontrollermemory. Valve removal is used e.g. at
disassemblingthevalveormodulereplacement(re‐registrationofanewmoduleisnecessary).